digraph test {
subgraph one {
style=filled;
color=lightgrey;
label= "Troi"
}
subgraph two {
style=filled;
color=lightgrey;
label= "Riker"
}
one -> two
"Picard" -> "Riker"
"Picard" -> "Troi" -> "Bev. Crusher"
"Bev. Crusher" -> Picard"

}
